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Accelerated testing for studying pavement design and performance (FY 2003) : evaluation of the chemical stabilized subgrade soil (CISL Experiment No. 12).
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2008-01-01
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[PDF-8.11 MB]
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Alternative Title:Evaluation of the chemical stabilized subgrade soil (CISL Experiment No. 12)
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Edition:Final report; Summer 2002-June 2003.
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Abstract:The Midwest States Accelerated Pavement Testing Pooled Fund Program, financed by the highway departments
of Missouri, Iowa, Kansas and Nebraska, has supported an accelerated pavement testing (APT) project to compare
the performance of stabilized clayey embankment soil when Portland cement, fly ash, lime and a commercial
product were used as stabilizing agents. The project aimed to improve the practices related to the design of flexible
pavements when the top of the subgrade is improved by chemical stabilization. The experiments were conducted
at the Civil Infrastructure Systems Laboratory (CISL) of Kansas State University. The test program consisted of
constructing four flexible pavement structures and subjecting them to full-scale accelerated loading test.
The study indicated that cement and lime are the most effective stabilizers for the studied soil. These stabilizers
resulted in lower vertical compressive stresses at the top of the subgrade and lower rut depth at the pavement surface
than the fly ash-treated soil. After more than two million axle load repetitions, the pavement with cement stabilized
embankment soil exhibited much less surface cracking than the pavement with fly-ash stabilized embankment.
The commercial product proved not to be effective in stabilizing the non-sulfate clayey soil used in this experiment,
when the embankment is constructed at the same moisture content and compaction level as for the other three
chemicals. The unconfined compression strength measured on laboratory prepared samples of soil stabilized with
the commercial chemical compound was very similar to that of the untreated soil.
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